docs: add PULL_REQUEST_TEMPLATE

.github/PULL_REQUEST_TEMPLATE.md

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+### Type of Change
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Documentation update
+- [ ] Refactoring
+- [ ] Hotfix
+- [ ] Security patch
+
+### Description
+_[Provide a detailed explanation of the changes you have made. Include the reasons behind these changes and any relevant context. Link any related issues.]_
+
+### Related Issue
+_[If this pull request addresses an issue, please link to it here (e.g., Fixes #123).]_
+
+### Checklist
+- [ ] My code adheres to the coding and style guidelines of the project.
+- [ ] I have performed a self-review of my own code.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have made corresponding changes to the documentation.